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Article
Publication date: 2 August 2013

Multi‐product maritime inventory routing with optional cargoes : An application to outbound automotive logistics

Saurabh Chandra, Rajiv K. Srivastava and Yogesh Agarwal

The ocean transportation of automobiles is carried out by specialized Roll‐on/Roll‐off ships, which are designed to carry a large number of automobiles at a time. Many of…

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Abstract

Purpose

The ocean transportation of automobiles is carried out by specialized Roll‐on/Roll‐off ships, which are designed to carry a large number of automobiles at a time. Many of these shipping companies have vertically integrated or collaborated with other logistics services providers to offer integrated maritime logistics solution to car manufacturers. The purpose of this study is to develop an optimization model to address the tactical level maritime logistics planning for such a company.

Design/methodology/approach

The problem is formulated as a mixed integer linear program and we propose an iterative combined Ant colony and linear programming‐based solution technique for the same.

Findings

This paper can integrate the maritime transportation planning of internally managed cargoes with the inventory management at the loading and discharging ports to minimize supply‐chain cost and also maximize additional revenue through optional cargoes using same fleet of ships.

Research limitations/implications

The mathematical model does not consider the variability in production and consumption of products across various locations, travel times between different nodes, etc.

Practical implications

The suggested mathematical model to the supply‐chain planning problem and solution technique can be considered in the development of decision support system for operations planning.

Originality/value

This paper extends the maritime inventory routing model by considering simultaneous planning of optional cargoes with internally managed cargoes.

Details

Journal of Advances in Management Research, vol. 10 no. 2
Type: Research Article
DOI: https://doi.org/10.1108/JAMR-05-2013-0035
ISSN: 0972-7981

Keywords

  • Maritime logistics
  • Inventory routing
  • Optional cargoes
  • Outbound automotive logistics
  • Ant colony algorithm
  • Inventory management
  • Optimization techniques

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Article
Publication date: 5 March 2018

Optimal operation of building microgrids – comparison with mixed-integer linear and continuous non-linear programming approaches

Vincent Reinbold, Van-Binh Dinh, Daniel Tenfen, Benoit Delinchant and Dirk Saelens

This paper aims to present two mathematical models to solve the Energy Management problem of a building microgrid (MG). In particular, it proposes a deterministic mixed…

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Abstract

Purpose

This paper aims to present two mathematical models to solve the Energy Management problem of a building microgrid (MG). In particular, it proposes a deterministic mixed integer linear programming (MILP) and non-linear programming (NLP) formulations. This paper focuses on the modelling process and the optimization performances for both approaches regarding optimal operation of near-zero energy buildings connected to an electric MG with a 24-h time horizon.

Design/methodology/approach

A general architecture of a MG is detailed, involving energy storage systems, distributed generation and a thermal reduced model of the grid-connected building. A continuous non-linear model is detailed along with linearizations for the mixed-integer liner formulation. Multi-physic, non-linear and non-convex phenomena are detailed, such as ventilation and air quality models.

Findings

Results show that both approaches are relevant for solving the energy management problem of the building MG.

Originality/value

Introduction and modelling of the thermal loads within the MG. The resulting linear program handles the mutli-objective trade-off between discomfort and the cost of use taking into account air quality criterion. Linearization and modelling of the ventilation system behaviour, which is generally non-linear and non-convex equality constraints, involving air quality model, heat transfer and ventilation power. Comparison of both MILP and NLP methods on a general use case provides a solution that can be interpreted for implementation.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 37 no. 2
Type: Research Article
DOI: https://doi.org/10.1108/COMPEL-11-2016-0489
ISSN: 0332-1649

Keywords

  • Microgrid
  • Mixed integer linear programming
  • Optimal operation
  • Sequential quadratic programming

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Article
Publication date: 20 July 2015

Multi-period demand allocation among supplier in a supply chain

Amol Singh

This paper aims to address the problem of optimal allocation of demand of items among candidate suppliers to maximize the purchase value of items. The purchase value of…

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Abstract

Purpose

This paper aims to address the problem of optimal allocation of demand of items among candidate suppliers to maximize the purchase value of items. The purchase value of the items directly relates to cost and quality of raw materials purchased from the supplier. In an increasingly competitive environment, firms are paying more attention to selecting the right suppliers for procurement of raw materials and component parts for their products. The present research work focuses on this issue of supply chain management.

Design/methodology/approach

This present research work devises a hybrid algorithm for multi-period demand allocation among the suppliers. The customer demand is allocated by using a hybrid algorithm based on the technique for order preference by similarity to ideal solution (TOPSIS), fuzzy set theory and the mixed linear integer programming (MILP) approaches.

Findings

The supply chain network is witnessing a changing business environment due to government policies aimed at promoting new small manufacturing enterprises (small and medium-sized enterprises) for intermediate parts and components. Hence, the managers have an option to select a new group of suppliers and allocate the optimal multi-period demand among the new group of suppliers to maximize their purchase value. In this context, the proposed hybrid model would be beneficial for the managers to operate their supply chain effectively and efficiently. The present research work will be helpful for the managers who are interested to reconfigure their supply chain under the failure of any supply chain partner or in a changing business environment. The model provides flexibility to the managers for evaluation of the different available alternatives to take a decision of optimal demand allocation among the suppliers. The proposed hybrid (fuzzy, TOPSIS and MILP) model provides more objective information for supplier evaluation and demand allocation among suppliers in a supply chain. The managers can use the proposed model to the analysis of other management decision-making problems.

Originality/value

This present research work devises a hybrid algorithm for multi-period demand allocation among the suppliers. This hybrid algorithm prioritizes the suppliers and then allocates the multi-period demand among the suppliers. The customer demand is allocated by using a hybrid algorithm based on the technique for order preference by similarity to ideal solution (TOPSIS), fuzzy set theory and the mixed linear integer programming (MILP) approaches.

Details

Journal of Modelling in Management, vol. 10 no. 2
Type: Research Article
DOI: https://doi.org/10.1108/JM2-09-2013-0046
ISSN: 1746-5664

Keywords

  • Operations management
  • Modeling
  • Supply chain management

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Article
Publication date: 11 September 2020

Eco-efficient management of a feeding system in an automobile assembly-line

Montserrat-Ana Miranda, María Jesús Alvarez, Cyril Briand, Matías Urenda Moris and Victoria Rodríguez

This study aims to reduce carbon emissions and costs in an automobile production plant by improving the operational management efficiency of a serial assembly line…

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Abstract

Purpose

This study aims to reduce carbon emissions and costs in an automobile production plant by improving the operational management efficiency of a serial assembly line assisted by a feeding electric tow vehicle (ETV).

Design/methodology/approach

A multi-objective function is formulated to minimize the energy consumption of the ETV from which emissions and costs are measured. First, a mixed-integer linear programming model is used to solve the feeding problem for different sizes of the assembly line. Second, a bi-objective optimization (HBOO) model is used to simultaneously minimize the most eco-efficient objectives: the number of completed runs (tours) by the ETV along the assembly line, and the number of visits (stops) made by the ETV to deliver kits of components to workstations.

Findings

The most eco-efficient strategy is always the bi-objective optimal solution regardless of the size of the assembly line, whereas, for single objectives, the optimization strategy differs depending on the size of the assembly line.

Research limitations/implications

Instances of the problem are randomly generated to reproduce real conditions of a particular automotive factory according to a previous case study. The optimization procedure allows managers to assess real scenarios improving the assembly line eco-efficiency. These results promote the implementation of automated control of feeding processes in green manufacturing.

Originality/value

The HBOO-model assesses the assembly line performance with a view to reducing the environmental impact effectively and contributes to reducing the existent gap in the literature. The optimization results define key strategies for manufacturing industries eager to integrate battery-operated motors or to address inefficient traffic of automated transport to curb the carbon footprint.

Details

Journal of Modelling in Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
DOI: https://doi.org/10.1108/JM2-10-2019-0241
ISSN: 1746-5664

Keywords

  • Optimization
  • Energy efficiency
  • Scheduling
  • Supply chain management
  • Ecological efficiency
  • Green assembly line operational management
  • Carbon footprint
  • Bi-objective optimization
  • Assembly line scheduling
  • Sustainable supply chain management

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Article
Publication date: 4 September 2020

A multi-objective optimization model for sustainable supply chain network with using genetic algorithm

Reza Ehtesham Rasi and Mehdi Sohanian

The purpose of this paper is to design and optimize economic and environmental dimensions in a sustainable supply chain (SSC) network. This paper developed a mixed-integer…

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Abstract

Purpose

The purpose of this paper is to design and optimize economic and environmental dimensions in a sustainable supply chain (SSC) network. This paper developed a mixed-integer linear programing (MILP) model to incorporate economical and environmental data for multi-objective optimization of the SSC network.

Design/methodology/approach

The overall objective of the present study is to use high-quality raw materials, at the same time the lowest amount of pollution emission and the highest profitability is achieved. The model in the problem is solved using two algorithms, namely, multi-objective genetic and multi-objective particle swarm. In this research, to integrate sustainable supplier selection and optimization of sustainability performance indicators in supply chain network design considering minimization of cost and time and maximization of sustainability indexes of the system.

Findings

The differences found between the genetic algorithms (GAs) and the MILP approaches can be explained by handling the constraints and their various logics. The solutions are contrasted with the original crisp model based on either MILP or GA, offering more robustness to the proposed approach.

Practical implications

The model is applied to Mega Motor company to optimize the sustainability performance of the supply chain i.e. economic (cost), social (time) and environmental (pollution of raw material). The research method has two approaches, namely, applied and mathematical modeling.

Originality/value

There is limited research designing and optimizing the SSC network. This study is among the first to integrate sustainable supplier selection and optimization of sustainability performance indicators in supply chain network design considering minimization of cost and time and maximization of sustainability indexes of the system.

Details

Journal of Modelling in Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
DOI: https://doi.org/10.1108/JM2-06-2020-0150
ISSN: 1746-5664

Keywords

  • Sustainability
  • Supply chain management
  • Multi-objective
  • Optimization
  • Meta-heuristic algorithms
  • Algorithms

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Article
Publication date: 20 September 2019

Vehicle routing analyses with integrated order picking and delivery problem under carbon cap and trade policy

Sanjay Jharkharia and Chiranjit Das

The purpose of this study is to model a vehicle routing problem with integrated picking and delivery under carbon cap and trade policy. This study also provides…

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Abstract

Purpose

The purpose of this study is to model a vehicle routing problem with integrated picking and delivery under carbon cap and trade policy. This study also provides sensitivity analyses of carbon cap and price to the total cost.

Design/methodology/approach

A mixed integer linear programming (MILP) model is formulated to model the vehicle routing with integrated order picking and delivery constraints. The model is then solved by using the CPLEX solver. Carbon footprint is estimated by a fuel consumption function that is dependent on two factors, distance and vehicle speed. The model is analyzed by considering 10 suppliers and 20 customers. The distance and vehicle speed data are generated using simulation with random numbers.

Findings

Significant amount of carbon footprint can be reduced through the adoption of eco-efficient vehicle routing with a marginal increase in total transportation cost. Sensitivity analysis indicates that compared to carbon cap, carbon price has more influence on the total cost.

Research limitations/implications

The model considers mid-sized problem instances. To analyze large size problems, heuristics and meta-heuristics may be used.

Practical implications

This study provides an analysis of carbon cap and price model that would assist practitioners and policymakers in formulating their policy in the context of carbon emissions.

Originality/value

This study provides two significant contributions to low carbon supply chain management. First, it provides a vehicle routing model under carbon cap and trade policy. Second, it provides a sensitivity analysis of carbon cap and price in the model.

Details

Management Research Review, vol. 43 no. 2
Type: Research Article
DOI: https://doi.org/10.1108/MRR-01-2019-0013
ISSN: 2040-8269

Keywords

  • Low carbon supply chain management (LCSCM)
  • Vehicle routing with integrated pick-up and delivery
  • Carbon cap and trade
  • Carbon footprint
  • Production and operations management
  • Vehicle routing with integrated pick-up and delivery
  • Carbon cap and trade
  • GHG emissions
  • Low carbon supply chain management (LCSCM)

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Article
Publication date: 8 January 2020

An innovative decision support tool for liquefied natural gas supply chain planning

Christos Papaleonidas, Dimitrios V. Lyridis, Alexios Papakostas and Dimitris Antonis Konstantinidis

The purpose of this paper is to improve the tactical planning of the stakeholders of the midstream liquefied natural gas (LNG) supply chain, using an optimisation…

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Abstract

Purpose

The purpose of this paper is to improve the tactical planning of the stakeholders of the midstream liquefied natural gas (LNG) supply chain, using an optimisation approach. The results can contribute to enhance the proactivity on significant investment decisions.

Design/methodology/approach

A decision support tool (DST) is proposed to minimise the operational cost of a fleet of vessels. Mixed integer linear programming (MILP) used to perform contract assignment combined with a genetic algorithm solution are the foundations of the DST. The aforementioned methods present a formulation of the maritime transportation problem from the scope of tramp shipping companies.

Findings

The validation of the DST through a realistic case study illustrates its potential in generating quantitative data about the cost of the midstream LNG supply chain and the annual operations schedule for a fleet of LNG vessels.

Research limitations/implications

The LNG transportation scenarios included assumptions, which were required for resource reasons, such as omission of stochasticity. Notwithstanding the assumptions made, it is to the authors’ belief that the paper meets its objectives as described above.

Practical implications

Potential practitioners may exploit the results to make informed decisions on the operation of LNG vessels, charter rate quotes and/or redeployment of existing fleet.

Originality/value

The research has a novel approach as it combines the creation of practical management tool, with a comprehensive mathematical modelling, for the midstream LNG supply chain. Quantifying future fleet costs is an alternative approach, which may improve the planning procedure of a tramp shipping company.

Details

Maritime Business Review, vol. 5 no. 1
Type: Research Article
DOI: https://doi.org/10.1108/MABR-09-2019-0036
ISSN: 2397-3757

Keywords

  • LNG
  • Contract assignment
  • Decision support tool
  • LNG supply chain
  • MILP
  • Tramp shipping

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Article
Publication date: 12 September 2016

Facility location for a closed-loop distribution network: a hybrid approach

Abhijeet Ghadge, Qifan Yang, Nigel Caldwell, Christian König and Manoj Kumar Tiwari

The purpose of this paper is to find a sustainable facility location solution for a closed-loop distribution network in the uncertain environment created by of high levels…

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Abstract

Purpose

The purpose of this paper is to find a sustainable facility location solution for a closed-loop distribution network in the uncertain environment created by of high levels of product returns from online retailing coupled with growing pressure to reduce carbon emissions.

Design/methodology/approach

A case study approach attempts to optimize the distribution centre (DC) location decision for single and double hub scenarios. A hybrid approach combining centre of gravity and mixed integer programming is established for the un-capacitated multiple allocation facility location problem. Empirical data from a major national UK retail distributor network is used to validate the model.

Findings

The paper develops a contemporary model that can take into account multiple factors (e.g. operational and transportation costs and supply chain (SC) risks) while improving performance on environmental sustainability.

Practical implications

Based on varying product return rates, SC managers can decide whether to choose a single or a double hub solution to meet their needs. The study recommends a two hub facility location approach to mitigate emergent SC risks and disruptions.

Originality/value

A two-stage hybrid approach outlines a unique technique to generate candidate locations under twenty-first century conditions for new DCs.

Details

International Journal of Retail & Distribution Management, vol. 44 no. 9
Type: Research Article
DOI: https://doi.org/10.1108/IJRDM-07-2015-0094
ISSN: 0959-0552

Keywords

  • Online retail
  • Reverse logistics
  • Product returns
  • Closed-loop supply chains
  • Facility location problem
  • Mathematical modelling

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Book part
Publication date: 20 November 2020

Daily Train Scheduling in Seaport Terminal: A MILP approach

L. S. M. Guedes, A. M. C. Bretas, C. H. F. Faria, B. T. Medeiros and B. D. Moreira

Brazil has been increasing its participation in the international trade market, mainly due to agricultural and forestry products, as in the case of soybeans and cellulose…

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Abstract

Brazil has been increasing its participation in the international trade market, mainly due to agricultural and forestry products, as in the case of soybeans and cellulose. This growth led to the expansion of the logistics infrastructure and its use. An important example of this trend is the port of São Luís, MA, in northern Brazil, which saw an increase in exports via rail (more than 200% growth in 6 years) and, consequently, an increase in the circulation of trains within its port complex.

This work proposes a mixed-integer linear programming model for the daily train scheduling problem at this port. All trains operated by VLI, a logistics company, are scheduled to minimize the departure times in order to improve the dwell time of freight train cars.

The railroad system in this Brazilian port consists of two classification yards, five terminals and a double-track railway for circulation. Different products such as grains, minerals, cellulose, and fuels are transported. The model also incorporates different operations at terminals and occupation restrictions due to maintenance and the physical flow of other third-party logistics companies. These features are modeled through a preprocessing step. In this phase, a series of auxiliary sets are defined to simplify constraints, circulation options are mapped, and the double-track is divided into segments based on the transit time with the objective to control track occupation.

This preprocess step also reduces the model complexity and, consequently, the computational time to solve it, as shown in the numerical tests using real-world operational data.

The main gains of the project were a reference train timetable for peak days, standardization of train crossing options, and a support tool for traffic adjustments with other rail operators.

Details

Supply Chain Management and Logistics in Emerging Markets
Type: Book
DOI: https://doi.org/10.1108/978-1-83909-331-920201008
ISBN: 978-1-83909-333-3

Keywords

  • Train scheduling
  • port operations
  • MILP
  • intermodal transportation
  • short-term planning
  • railcar dwell time
  • agricultural products logistics

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Article
Publication date: 3 August 2020

Multi-objective TMA management optimization using the point merge system

Ramazan Kursat Cecen

The purpose of this study is to provide conflict-free operations in terminal manoeuvre areas (TMA) using the point merge system (PMS), airspeed reduction (ASR) and ground…

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Abstract

Purpose

The purpose of this study is to provide conflict-free operations in terminal manoeuvre areas (TMA) using the point merge system (PMS), airspeed reduction (ASR) and ground holding (GH) techniques. The objective is to minimize both total aircraft delay (TD) and the total number of the conflict resolution manoeuvres (CRM).

Design/methodology/approach

The mixed integer linear programming (MILP) is used for both single and multi-objective optimization approaches to solve aircraft sequencing and scheduling problem (ASSP). Compromise programming and ε-constraint methods were included in the methodology. The results of the single objective optimization approach results were compared with baseline results, which were obtained using the first come first serve approach, in terms of the total number of the CRM, TD, the number of aircraft using PMS manoeuvres, ASR manoeuvres, GH manoeuvres, departure time updates and on-time performance.

Findings

The proposed single-objective optimization approach reduced both the CRM and TD considerably. For the traffic flow rates of 15, 20 and 25 aircraft, the improvement of CRM was 53.08%, 41.12% and 32.6%, the enhancement of TD was 54.2%, 48.8% and 31.06% and the average number of Pareto-optimal solutions were 1.26, 2.22 and 3.87, respectively. The multi-objective optimization approach also exposed the relationship between the TD and the total number of CRM.

Practical implications

The proposed mathematical model can be implemented considering the objectives of air traffic controllers (ATCOs) and airlines operators. Also, the mathematical model is able to create conflict-free TMA operations and, therefore, it brings an opportunity for ATCOs to reduce frequency occupancy time.

Originality/value

The mathematical model presents the total number of CRM as an objective function in the ASSP using the MILP approach. The mathematical model integrates ATCOs’ and airline operators’ perspective together with new objective functions.

Details

Aircraft Engineering and Aerospace Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
DOI: https://doi.org/10.1108/AEAT-09-2019-0181
ISSN: 1748-8842

Keywords

  • Aircraft sequencing and scheduling problem
  • Point merge system
  • Mixed-integer linear programming
  • Multi-objective optimization

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